CN107523989B - Ammonia fumigation equipment for fiber tows - Google Patents
Ammonia fumigation equipment for fiber tows Download PDFInfo
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- CN107523989B CN107523989B CN201710880541.1A CN201710880541A CN107523989B CN 107523989 B CN107523989 B CN 107523989B CN 201710880541 A CN201710880541 A CN 201710880541A CN 107523989 B CN107523989 B CN 107523989B
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- Prior art keywords
- ammonia
- tow
- fiber
- fiber tows
- tows
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
- D06M11/59—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with ammonia; with complexes of organic amines with inorganic substances
- D06M11/60—Ammonia as a gas or in solution
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/24—Polymers or copolymers of alkenylalcohols or esters thereof; Polymers or copolymers of alkenylethers, acetals or ketones
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/30—Flame or heat resistance, fire retardancy properties
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention relates to an ammonifying device for fiber tows, which comprises: a tow inlet; the rolling and widening device rolls and widens the fiber tows to be treated; a positive pressure nitrogen protection zone disposed downstream of the roller compaction widening apparatus and having a nitrogen inlet; an ammonia fumigation tube body adjoining the positive pressure nitrogen protection zone and having an ammonia gas inlet, a plurality of horizontal straight sections and a plurality of curved connection sections, each curved connection section connecting adjacent two horizontal straight sections such that the entire ammonia fumigation tube body assumes the shape of a serpentine coil in which rolled and broadened fiber tows travel in the longitudinal direction thereof after passing through the positive pressure nitrogen protection zone; the ammonia gas guide plates are vertically arranged in the ammonia fumigation tube body relative to the advancing direction of the tows; a tow outlet.
Description
Technical Field
The invention relates to an ammonifying device for fiber tows.
Background
The general Lu Ben flame-retardant finishing technology is a halogen-free flame-retardant finishing technology for cellulose fiber fabrics, and is generally realized by adopting tetrakis (hydroxymethyl) phosphonium chloride or derivatives thereof as finishing liquid, and the fabric is subjected to the technological processes of padding, predrying, ammonifying, oxidizing, washing and drying. Traditionally, the halogen-free flame retardant finishing process flow is developed for fabrics containing cellulose fibers (including cotton, viscose, cuprammonium, acetate and other regenerated cellulose fibers). For the field of flame-retardant fiber production, no proper device is available for directly performing Proban finishing on fiber tows to obtain flame-retardant fibers with durable flame retardance. Most of the production modes of the flame-retardant fiber are that the flame-retardant particles are blended with the fiber, the mechanical properties of the flame-retardant fiber prepared by the mode are inevitably greatly influenced, for example, the strength of the halogen-free flame-retardant viscose fiber of Oryland essence is only about 2.5cN/dtex at most, the flame-retardant fiber is obtained by adding the flame retardant and the fiber-forming polymer blended yarn for non-flame-retardant polymers, and the strength level of the flame-retardant fiber obtained by the method is lower. And flame-retardant fibers with good mechanical properties can be obtained by performing flame-retardant treatment on the fibers in a general Lu Ben after-finishing mode, so that the application of the fibers is enlarged. However, the current general Lu Ben after-finishing equipment is designed for the fabric invention, and no related report exists for the continuous general Lu Ben finishing equipment of fiber filament bundles. The technical proposal related to the steps of padding, predrying and the like can be carried out by referring to the equipment process of fabric general Lu Ben finishing, and for ammonia fumigation equipment, the ammonia fumigation equipment structure needs to be specially designed due to the particularity of the filament bundle structure so as to ensure the uniform permeation reaction of ammonia gas to the filament bundles, avoid the adhesion among fibers in the filament bundles and the leakage of the ammonia gas, and ensure the continuous and stable carrying out of the ammonia fumigation process of the filament bundles.
The above description of the background is only for the purpose of facilitating a thorough understanding of the present invention's aspects (in terms of the means of technology used, the technical problems solved, and the technical effects produced, etc.) and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an ammonia fumigation device which can carry out direct ammonia fumigation on fiber tows and avoid ammonia leakage, and can also solve the problems that ammonia in the ammonia fumigation process of flame-retardant finishing filament tows is difficult to permeate into the tows and the fibers in the tows are adhered.
The invention relates to an ammonifying device for fiber tows, which comprises: a tow inlet through which a fiber tow to be treated enters the ammonia fumigation device; the rolling and widening device rolls and widens the fiber tows to be treated; a positive pressure nitrogen protection zone disposed downstream of the roller compaction widening apparatus and having a nitrogen inlet; an ammonia fumigation tube body adjoining the positive pressure nitrogen protection zone and having an ammonia gas inlet, a plurality of horizontal straight sections and a plurality of curved connection sections, each curved connection section connecting adjacent two horizontal straight sections such that the entire ammonia fumigation tube body assumes the shape of a serpentine coil in which rolled and broadened fiber tows travel in the longitudinal direction thereof after passing through the positive pressure nitrogen protection zone; the ammonia gas guide plates are vertically arranged in the ammonia fumigation tube body relative to the advancing direction of the tows; a tow outlet disposed at an end of the ammonification tube and allowing the ammonified fiber tow to exit the ammonification apparatus.
In one embodiment of the invention, the nip means consists of a nip roller disposed downstream of the tow inlet for nip-widening the fiber tow to be treated and a nip support platform disposed horizontally below the nip roller for supporting the nip-widened fiber tow during the nip.
In another embodiment of the invention, a pair of rollers are provided downstream of the nip widening apparatus and upstream of the positive pressure nitrogen protection zone to drag the crimped fiber tow, the rollers being adjustable to accommodate fiber tows of different fineness.
In another embodiment of the invention, a rubber gas seal is provided in a gas tight manner downstream of the pressure roll and upstream of the positive pressure nitrogen protection zone.
In another embodiment of the invention, a nitrogen pressure gauge is arranged in the positive pressure nitrogen protection zone, an ammonia pressure gauge is arranged in the ammonia pipe body, and the nitrogen pressure gauge and the ammonia pressure gauge are regulated so that the nitrogen pressure in the positive pressure nitrogen protection zone is greater than or equal to the ammonia pressure in the ammonia pipe body, thereby avoiding ammonia leakage.
In another embodiment of the invention, 5-15 sets of synchronous pulling pairs of rollers are provided in pairs along the longitudinal direction thereof in the ammonia-fumigating tube, the synchronous pulling pairs pulling the fiber tows to travel in the ammonia-fumigating tube.
In another embodiment of the invention, polytetrafluoroethylene diverting sliders are provided in the curved connecting section to guide the diverting of the fiber tows in the curved connecting section and to reduce friction of the fiber tows during the diverting.
In another embodiment of the invention, the ammonia fumigation tube body is provided with a heating spacer for heating and a viewing window for observation.
In another embodiment of the invention, the ammonia fumigation tube has a tail gas outlet disposed upstream of the tow outlet.
In another embodiment of the invention, an outlet gap adjustment roller is provided at the tow outlet, which is adjustable to accommodate fiber tows of different fineness.
Drawings
Fig. 1 shows a schematic view of an ammonifying apparatus of a fiber tow according to the present invention.
List of reference numerals:
1: tow inlet
2: rolling widening roller
3: compression roller
4: rubber air seal device
5: nitrogen inlet
6: nitrogen gas
7: positive pressure nitrogen protection zone
8: nitrogen pressure gauge
9: ammonia pressure gauge
10: ammonia gas inlet
11: ammonia fumigation tube
12: synchronous traction pair roller
13: polytetrafluoroethylene steering slide block
14: tail gas outlet
15: tail gas
16: outlet gap adjusting press roller
17: ammonia gas guide plate
18: tow outlet
19: rolling and widening supporting platform
20: a fiber tow.
Detailed Description
The inventive concept of the present invention includes a plurality of specific embodiments, and different embodiments have technical or application emphasis, and different embodiments can be combined and matched to meet different application scenarios and solve different application requirements. Therefore, the following description of specific embodiments should not be construed as limiting the technical solutions that the invention is intended to protect.
The ammonia fumigation equipment is suitable for padding dried fiber big tows which are applied with the tetrakis (hydroxymethyl) phosphonium chloride or the tetrakis (hydroxymethyl) phosphonium sulfate, and comprises ordinary vinylon and high-strength vinylon which are subjected to acetalation processing, wherein the acetalation degree of the PVA big tows is 0-50% of a specific acetalation degree; common viscose filament yarn big tows, high wet modulus viscose filament yarn big tows, solvent spun regenerated cellulose filament yarn (tencel) big tows and acetate fiber filament big tows, wherein the fineness range of the tows is 10-100 ten thousand denier; the water content is 10 to 25% by weight.
The fiber tows are rolled and stretched through the tow inlet 1 and have thickness not exceeding 3mm under the action of the rolling and stretching roller 2 so as to be beneficial to the permeation of the tows by ammonia gas in fumigation equipment, a rolling and stretching supporting platform 19 is arranged below the rolling and stretching roller 2 so as to support the rolled and stretched fiber tows, a pair of press rollers 3 are arranged at the downstream of the rolling and stretching roller 2 and the rolling and stretching supporting platform 19 so as to play a primary airtight role and drag the rolled and stretched fiber tows 20, and the press rollers 3 can be adjusted so as to adapt to the fiber tows 20 with different fineness. A rubber gas seal device 4 is arranged between the press roll 3 and the positive pressure nitrogen protection zone 7, a positive pressure nitrogen protection zone 7 with a length not exceeding 0.5m and an ammonia fumigation pipe body 11 adjacent to the positive pressure nitrogen protection zone 7 are arranged immediately downstream of the rubber gas seal device 4, the positive pressure nitrogen protection zone 7 is provided with a nitrogen inlet 5 for introducing heated nitrogen 6 and is provided with a nitrogen pressure gauge 8 so as to regulate the nitrogen pressure in the positive pressure nitrogen protection zone 7. The ammonia-smoking pipe body 11 has an ammonia gas inlet 10 for introducing heated ammonia gas, and has a plurality of horizontal straight sections and a plurality of curved connecting sections, each connecting two adjacent horizontal straight sections, so that the entire ammonia-smoking pipe body 11 assumes the shape of a serpentine coil, and the rolled and widened fiber tows 20 travel in the ammonia-smoking pipe body 11 along the longitudinal direction thereof. The ammonia pressure gauge 9 is arranged in the ammonia smoking pipe body 11, the nitrogen pressure gauge 8 and the ammonia pressure gauge 9 are adjusted so that the nitrogen pressure in the positive pressure nitrogen protection zone 7 is greater than or equal to the ammonia pressure in the ammonia smoking pipe body 11, so that ammonia leakage is avoided, and a small amount of nitrogen enters the ammonia smoking pipe body 11 and does not influence the ammonia smoking reaction. In order to heat and facilitate observation, the ammonia fumigation tube body 11 is also provided with a heating spacer bush and an observation window, and the heating temperature interval of the heating sleeve is 0-100 ℃. 5-15 sets (6 sets are shown in fig. 1) of synchronous pulling counter rollers 12 are provided in the ammonia-fumigating tube 11 along the longitudinal direction thereof so as to pull the fiber tows 20 to travel in the ammonia-fumigating tube 11. In the curved connecting section of the ammonia-fumigating tube body 11, a polytetrafluoroethylene diverting slider 13 is provided, which polytetrafluoroethylene diverting slider 13 guides the fiber tows 20 to be diverted in the curved connecting section and reduces friction of the fiber tows 20 during the diverting. A plurality of ammonia guide plates 17 are arranged in the ammonia fumigation tube body 11, the ammonia guide plates 17 are vertically arranged relative to the advancing direction of the tows, and turbulent turbulence is generated in the flowing process of ammonia due to the blocking of the ammonia guide plates 17, so that the ammonia is more uniformly contacted with the fiber tows 20 and fully reacted with the fiber tows 20, the infiltration degree of the ammonia to the fiber tows 20 is improved, and the ammonia is prevented from directly flowing to an outlet through a gap between the ammonia fumigation tube body 11 and the fiber tows 20. The end of the ammonification tube 11 is provided with a tow outlet 18 to allow the ammonified fiber tow 20 to exit the ammonification apparatus. An adjustable outlet gap adjustment press roll 16 is provided at the tow outlet 18 to accommodate fiber tows 20 of different fineness. The ammonification tube 11 has a tail gas outlet 14 provided upstream of the tow outlet 18 for discharging a tail gas 15. In the ammonia fumigation process, as ammonia and the tetra-methylol phosphorus compound continuously react, the final ammonia content is smaller and smaller, the partial pressure of ammonia is lower and lower, and the whole gas pressure is reduced, so that when the tail gas outlet 14 has a slight negative pressure, air is sucked from the tow outlet 18 at the tail end of the ammonia fumigation tube body 11, and the processing system is ensured not to leak ammonia. The tail gas outlet 14 is subjected to micro air suction by a micro air blower to generate negative pressure, and the extracted ammonia gas and air mixture is sprayed by water mist to absorb the ammonia gas contained in the tail gas. The ammonia-treated fiber tows 20 may undergo a subsequent oxidation stage after exiting the tow outlet 18.
The ammonia fumigation device is suitable for various filament bundles which can be subjected to common Lu Ben finishing, and various flame-retardant cellulose fibers and flame-retardant vinylon short fibers can be prepared by oxidation, water washing, drying, curling and cutting, so that the processing cost of the prepared fibers is low, compared with the flame-retardant viscose FR fibers produced by Austrian essence company with highest flame retardant property and mechanical property at present, the flame-retardant processing is carried out on the large filament bundles by adopting the device, and the selling price can be reduced by more than half. In addition, the design of the positive pressure nitrogen protection area can avoid the leakage of ammonia, and the adjusting press roller can be suitable for ammonifying fiber tows with different fineness.
The description of the exemplary embodiments presented above is merely illustrative of the technical solution of the present invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those of ordinary skill in the art. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable others skilled in the art to understand, make and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (7)
1. An ammonifying apparatus for fiber tows, comprising:
a tow inlet through which a fiber tow to be treated enters the ammonia fumigation device;
the rolling and widening device rolls and widens the fiber tows to be treated;
a positive pressure nitrogen protection zone disposed downstream of the roller compaction widening apparatus and having a nitrogen inlet;
an ammonia fumigation tube body adjoining the positive pressure nitrogen protection zone and having an ammonia gas inlet, a plurality of horizontal straight sections and a plurality of curved connection sections, each curved connection section connecting adjacent two horizontal straight sections such that the entire ammonia fumigation tube body assumes the shape of a serpentine coil in which rolled and broadened fiber tows travel in the longitudinal direction thereof after passing through the positive pressure nitrogen protection zone;
the ammonia gas guide plates are vertically arranged in the ammonia fumigation tube body relative to the advancing direction of the tows;
a tow outlet disposed at an end of the ammonification tube and allowing the ammonified fiber tow to exit the ammonification apparatus,
a pair of press rollers are arranged at the downstream of the rolling widening device and the upstream of the positive pressure nitrogen protection area so as to drag rolled and widened fiber tows, the press rollers are adjustable so as to adapt to fiber tows with different fineness, a rubber air sealing device is arranged at the downstream of the press rollers and the upstream of the positive pressure nitrogen protection area in an airtight mode, and the ammonia fumigation tube body is provided with a tail gas outlet arranged at the upstream of a tow outlet.
2. The apparatus according to claim 1, wherein the spreading roller is disposed downstream of the tow inlet to spread the fiber tow to be treated, and a spreading support platform horizontally disposed below the spreading roller to support the spread fiber tow during spreading.
3. The apparatus according to claim 1, wherein a nitrogen pressure gauge is provided in the positive pressure nitrogen protection zone, and an ammonia pressure gauge is provided in the ammonia pipe, the nitrogen pressure gauge and the ammonia pressure gauge being adjusted such that the nitrogen pressure in the positive pressure nitrogen protection zone is greater than or equal to the ammonia pressure in the ammonia pipe to avoid leakage of ammonia.
4. The apparatus according to claim 1, wherein 5 to 15 sets of synchronous pulling counter rollers are provided in pairs along the longitudinal direction thereof in the ammonia-smoking pipe, the synchronous pulling counter rollers pulling the fiber tow to travel in the ammonia-smoking pipe.
5. The apparatus according to claim 1, wherein polytetrafluoroethylene diverting slide is provided in the curved connection section to guide the diverting of the fiber tows in the curved connection section and to reduce friction of the fiber tows during the diverting.
6. The ammonia fumigation device for fiber tows of claim 1, wherein said ammonia fumigation tube is provided with a heating spacer for heating and a viewing window for viewing.
7. The ammonia fumigation arrangement of fiber tows, as claimed in claim 1, characterized in that an outlet gap adjusting press roll is provided at the tow outlet, said outlet gap adjusting press roll being adjustable to accommodate fiber tows of different fineness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710880541.1A CN107523989B (en) | 2017-09-26 | 2017-09-26 | Ammonia fumigation equipment for fiber tows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710880541.1A CN107523989B (en) | 2017-09-26 | 2017-09-26 | Ammonia fumigation equipment for fiber tows |
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| Publication Number | Publication Date |
|---|---|
| CN107523989A CN107523989A (en) | 2017-12-29 |
| CN107523989B true CN107523989B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710880541.1A Active CN107523989B (en) | 2017-09-26 | 2017-09-26 | Ammonia fumigation equipment for fiber tows |
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| CN (1) | CN107523989B (en) |
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| CN112853865A (en) * | 2021-03-03 | 2021-05-28 | 江苏共创人造草坪股份有限公司 | High-elasticity spiral artificial lawn and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946497A (en) * | 1973-01-15 | 1976-03-30 | United Merchants And Manufacturers, Inc. | Apparatus for treating textile fabric to retard inflammability |
| US4244692A (en) * | 1978-07-24 | 1981-01-13 | Dixie Yarns, Inc. | Process for manufacturing flame-retardant yarn |
| CN202193971U (en) * | 2011-08-08 | 2012-04-18 | 江苏华瑞国际实业集团有限公司 | Ammonia fumigation crosslinking device for pure cotton knitted fabric |
| CN105586745A (en) * | 2014-10-23 | 2016-05-18 | 山东芦氏特种面料科技有限公司 | Ammonia fumigating washing system of flame retardant fabric |
| CN205238600U (en) * | 2015-11-12 | 2016-05-18 | 陕西天策新材料科技有限公司 | Wide thinization processing apparatus of big silk bundle fibre exhibition |
| CN106480550A (en) * | 2016-10-31 | 2017-03-08 | 哈尔滨天顺化工科技开发有限公司 | A kind of labyrinth type gas lock and its control device for carbon fiber production |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8635846B2 (en) * | 2006-11-15 | 2014-01-28 | Lorica International Corporation | Fire retardant fabrics and methods for making the same |
-
2017
- 2017-09-26 CN CN201710880541.1A patent/CN107523989B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946497A (en) * | 1973-01-15 | 1976-03-30 | United Merchants And Manufacturers, Inc. | Apparatus for treating textile fabric to retard inflammability |
| US4244692A (en) * | 1978-07-24 | 1981-01-13 | Dixie Yarns, Inc. | Process for manufacturing flame-retardant yarn |
| CN202193971U (en) * | 2011-08-08 | 2012-04-18 | 江苏华瑞国际实业集团有限公司 | Ammonia fumigation crosslinking device for pure cotton knitted fabric |
| CN105586745A (en) * | 2014-10-23 | 2016-05-18 | 山东芦氏特种面料科技有限公司 | Ammonia fumigating washing system of flame retardant fabric |
| CN205238600U (en) * | 2015-11-12 | 2016-05-18 | 陕西天策新材料科技有限公司 | Wide thinization processing apparatus of big silk bundle fibre exhibition |
| CN106480550A (en) * | 2016-10-31 | 2017-03-08 | 哈尔滨天顺化工科技开发有限公司 | A kind of labyrinth type gas lock and its control device for carbon fiber production |
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|---|---|
| CN107523989A (en) | 2017-12-29 |
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Effective date of registration: 20171214 Address after: 751100 Ningxia Wuzhong City Litong District High Bay p.miliaceum Applicant after: NINGXIA QUANYU NEW MATERIAL CO.,LTD. Applicant after: SHANGHAI QUANYU BIOTECH SUIPING CO.,LTD. Address before: 751100 the Ningxia Hui Autonomous Region Wuzhong City Litong District High Bay p.miliaceum Applicant before: NINGXIA QUANYU NEW MATERIAL CO.,LTD. |
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